Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 736 · 40 questions

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

1. 1.19 × 16 =
2. 2.30 × 24 =
3. 3.37 × 12 =
4. 4.35 × 15 =
5. 5.22 × 16 =
6. 6.11 × 12 =
7. 7.11 × 14 =
8. 8.16 × 12 =
9. 9.33 × 14 =
10. 10.20 × 24 =
11. 11.32 × 12 =
12. 12.18 × 16 =
13. 13.23 × 14 =
14. 14.20 × 16 =
15. 15.13 × 24 =
16. 16.23 × 18 =
17. 17.38 × 18 =
18. 18.42 × 12 =
19. 19.41 × 16 =
20. 20.20 × 18 =
21. 21.25 × 18 =
22. 22.34 × 16 =
23. 23.40 × 15 =
24. 24.45 × 12 =
25. 25.28 × 15 =
26. 26.46 × 18 =
27. 27.13 × 14 =
28. 28.15 × 16 =
29. 29.18 × 14 =
30. 30.15 × 24 =
31. 31.33 × 24 =
32. 32.30 × 14 =
33. 33.48 × 14 =
34. 34.23 × 15 =
35. 35.47 × 24 =
36. 36.44 × 15 =
37. 37.31 × 12 =
38. 38.23 × 12 =
39. 39.12 × 14 =
40. 40.16 × 15 =

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